| 摘要 |
There is disclosed a turbodrill having thrust bearings received within an annular space between its shaft and case to support the shaft for rotation within the case, and a face seal closing off the lower end of the space beneath seal rings forming a lubricant chamber in which the bearings are contained. One seal ring of the face seal is carried by the case for rotation therewith, and the other seal ring thereof is carried by a sleeve for rotation therewith. The sleeve extends from within the space to a level beneath the case, and is connected to the shaft for rotation therewith. Means are provided for moving the sleeve longitudinally with respect to the shaft in order to adjust the preload applied by springs to the other seal ring of the face seal.
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